Piezo Audio Transducer Failure Detection by Multi-Frequency Power Slope
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Solution Overview
Problem
Existing medical devices relying on piezo transducers for alarms often fail to detect transducer failures, leading to missed alerts and potential harm to users, as current testing methods require user intervention or are inconvenient.
Innovation Solution
A processor-implemented method that disables non-essential components, drives the piezo audio transducer at multiple frequencies, calculates power consumption, and generates a health metric based on slope values to detect transducer failures, sending alerts if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If user-initiated testing or periodic system-initiated testing is used for piezo transducer failure detection, then the device complexity is reduced, but the reliability of failure detection deteriorates because users may not initiate testing or periodic testing may be inconvenient
Solution Approach 1:
The piezo transducer testing system performs self-diagnosis by automatically driving the transducer at multiple frequencies and analyzing power consumption patterns without requiring user intervention. The system independently executes test sequences, disables non-essential components to isolate measurements, and generates failure alerts autonomously, making the system self-sufficient for reliability monitoring.
Solution Approach 2:
The system performs preliminary testing actions by proactively driving the piezo transducer at multiple frequencies before actual use and continuously monitoring power consumption patterns. This preliminary detection capability identifies potential failures before they affect alarm functionality, ensuring reliable operation during critical moments.
2Measurement precision
If non-essential components are disabled and MCUs are forced into full active mode for accurate power consumption measurement, then the measurement precision improves, but the productivity of the device deteriorates due to reduced operational functionality during testing
Solution Approach 1:
The testing process is segmented into distinct phases: isolation phase where non-essential components are disabled for accurate measurement, and operational phase where normal functionality is restored. This segmentation allows precise power consumption measurements during testing while maintaining high productivity during normal operation, as the two states do not overlap in time.
Solution Approach 2:
The system implements periodic testing sequences where non-essential components are temporarily disabled for brief measurement intervals, then reactivated. This periodic action enables accurate power consumption measurements without permanently reducing device functionality, maintaining productivity between test cycles while ensuring measurement precision during test windows.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables periodic, user-independent detection of piezo transducer failures, reducing the risk of missed alarms and user harm by ensuring timely notification of device malfunctions.
Implementation Method 1
various other medical devices monitor physiological parameters of a person... alarms are audible and/or vibratory in nature and are created by use of a piezo transducer
Implementation Method 2
determines the amount of power consumed by the piezo audio transducer when being driven at those frequencies... measuring the input voltage and current to the piezo audio transducer
Data Source
AI summary
Disclosed herein are techniques related to detecting failures in piezo audio transducers. In some embodiments, the techniques may involve disabling non-essential components and peripherals and forcing microcontroller units into full active mode. The piezo audio transducer is driven at each of a plurality of driving frequencies and, for each driving frequency, the amount of power consumed by the piezo audio transducer is determined. Slope values are determined for each pair or driving frequencies. Based on these slopes, the disclosed techniques generate a piezo health metric for the piezo audio transducer indicating whether the piezo audio transducer passed or failed the test. If the piezo audio transducer fails the test, an appropriate warning or alert can be sent to one or more users and/or other devices.